the world > action or operation > behaviour > good behaviour > [adverb] > tactfully
the world > action or operation > ability > skill or skilfulness > [adverb] > with skilful management > in dealing with others
1880 I. L. Bird II. 72 Ito very tactfully neither gave it [the message] nor told me of it.
1889 21 Dec. 980 To both deputations Mr. Chaplin replied tactfully.